Flightgear is a package that you have installed, its a flight simulator,
and it certainly is the cause of the upgrade not being calculated as we
can see in VarLogDistupgradeAptlog.txt.

Investigating (8) flightgear-data-base [ i386 ] < none -> 3.0.0-1 > ( 
universe/games )
Broken flightgear-data-base:i386 Breaks on flightgear [ i386 ] < 2.4.0-1 -> 
3.0.0-1 > ( universe/games ) (< 3.0.0~)
  Considering flightgear:i386 -1 as a solution to flightgear-data-base:i386 4
  Upgrading flightgear:i386 due to Breaks field in flightgear-data-base:i386
Investigating (8) flightgear [ i386 ] < 2.4.0-1 -> 3.0.0-1 > ( universe/games )
Broken flightgear:i386 Depends on libopenscenegraph99 [ i386 ] < none -> 
3.2.0~rc1-4ubuntu0.1 > ( universe/libs )
  Considering libopenscenegraph99:i386 3 as a solution to flightgear:i386 -1
  MarkKeep flightgear [ i386 ] < 2.4.0-1 -> 3.0.0-1 > ( universe/games ) FU=0
  Holding Back flightgear:i386 rather than change libopenscenegraph99:i386
Investigating (9) flightgear-data-base [ i386 ] < none -> 3.0.0-1 > ( 
universe/games )
Broken flightgear-data-base:i386 Breaks on flightgear [ i386 ] < 2.4.0-1 -> 
3.0.0-1 > ( universe/games ) (< 3.0.0~)
  Considering flightgear:i386 -1 as a solution to flightgear-data-base:i386 4
  Upgrading flightgear:i386 due to Breaks field in flightgear-data-base:i386
Investigating (9) flightgear [ i386 ] < 2.4.0-1 -> 3.0.0-1 > ( universe/games )
Broken flightgear:i386 Depends on libopenscenegraph99 [ i386 ] < none -> 
3.2.0~rc1-4ubuntu0.1 > ( universe/libs )
  Considering libopenscenegraph99:i386 3 as a solution to flightgear:i386 -1
  MarkKeep flightgear [ i386 ] < 2.4.0-1 -> 3.0.0-1 > ( universe/games ) FU=0
  Holding Back flightgear:i386 rather than change libopenscenegraph99:i386
Done

If you don't use flightgear, then uninstall it and the upgrade will be
calculateable.

** Changed in: update-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1547171

Title:
  dist-upgrade cannot calculate packages, upgrade manager crashes, NOT
  related to Flight Gear installation

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